Method of and apparatus for delivering measured charges



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UNITED "STATES PATENT o F ca.

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Application filed June is, 1925.: Serial No. 37,400.

This invention is designed particularly for delivering measured charges of fuel to oil burning engines.

, paratively very small but in order to affect a proper control and operation of the engine for the various loads it is desirable that the measurin be veryaccurately done not only as to t etotal quantity of fuel but where there are a number of cylinders as 19 to the amount fed to each cylinder.

measuring charge which is de ivered to the" forcing pum in each operation. Features and details 0 the invention will appear from the specification and claims. t r p The invention is illustrated in the accompanying drawingswhich show an apparatus for carrying out the method as follows Fig. 1 isa central vertical section through 25 an engine with the controlling apparatus thereon. p 0 Fig. 2 an endelevation, parts bemgin section to better show construction.

Fig. 3 an illustrative diagram of the ap- 80 paratus.

' 1 marks the frame crank case, 4 the cylinders, 5 water packets for the cylinders formed in the frame, 6 pistons operating the cylinders, 7 connecting 85 rods, 8 cranks, 9 a crank shaft in which the: cranks are formed, 10 crank shaft bearings; '11 spray nozzles, 12 pipes leading to the:

spraynozzles, 13 a forcing pump, one for each cylinder, forcing the, fuel to the spray -40 nozzles, 14 a gear driving the force pumps through a shaft 14, 15 a gear with which the gear 14 meshes, the gear 15 being mounted on the crank shaft, 16 delivery pipes deliverin fuel to the forc ng pumps, 45 17 a pipe disc arging to the pipes 16, 18

a rotary pump formm part of the measuring device, and 19 a ypass valve leading from the pipe 17 and controlling the moment of delivery to the force pumps. The by- 50 ass valve is controlled by a governor driven from'a shaft 21.' The shaft 21' is driven by agear 22 meshing with the gear 14. A sleeve 23 is responsive to the governor action"anc l delivers itsmovement to a These charges are comprefer pumpand thus.

of the engine, 2 the lever 24. .The lever 24 is connected, by a link 25 with devices actuating the bypass.

The pump 18 of the measuring device is a ly of the rotary type having an intake 26 and involves ears 18, one of which is mounted on the sha t 14. These gears are mounted in a pump chamber 18".

The bypass valve 19 has a body 27 and a pipe 28. leading from the pipe 17 connects the pipe 17 with a chamber 29 of the valve. A valve head 30 operates one seat 31 and controls the bypass o ening 31. A discharge pipe 32 leads om this openingto the common source of supply of fuel. A

spring 33 operates on the stem 31 of the bypass valve andtends to hold it in closed posit on. A push rod 34 is arranged inthe packing 35 and leadsfrom the end-of .the

stem 31" to without the body 27 and is operated upon by a tappet 36 carried b a rock arm 37. The rock arm 37 is mounted on a rock shaft 38,the rock shaft being carried by a hanger 39 on a sleeve 40, the pur ose of the sleeve being hereinafter more fullydescribed. A cam platen. 41 is rotatably mounted in the rock arm and operates against a cam-42, the cam havingthe raised portions 44 which are concentric and'depressions- '43. When the platen dro s into the depressions 43, it permits the the rock arm and consequently the closing of the bypass valve under the influence of .the spring 33. vWhen on the raised ortion 44 the rock arm is thrown .upward y thus opening the bypass valve.

The force pump has a pump chamber 45 with a liner 46. A pump plunger 47 operates -1n the liner and 1S provided with a head 48. A spring 49 is arranged around the plunger under the head 48 and tends to retract the plunger. A guide head 50 operates on the head 48 and this is engaged by a rolling block 51 carried by a--rock.arm 52. The rock arm 52 is mounted on a rock shaft 53 and carries a roller 54. The roller is operated upon b a cam 55 shown in dotted lines in Fig. 2, t e several cams being shown in outline in Fig. 3, all the cams bein carried topping of an inlet chamber 56. and the passage 57 leads from this'chamber to the pump chamber. An inlet valve 58 controls the passage 57 and a spring 59 operates on the stem 58'.

of the inlet valve and tends to close the same.

The fuel is discharged from the force pump This is provi ed with the usual valve 62 loaded by a spring 63.

The sleeve 40 ishung on a pin, 64 which" is carried by a trunnion 65 in bearings 66 on the frame. The pin 64 is eccentric to the trunnion and consequently slightly raises and lowers the sleeve 40 as the pin 64 is swung. A lever arm '66 is carried by the pin Get and this is connected by the link 25 with the lever 24. The lever 24 is preferably formed with two arms, one of which is shown in Fig. 2 and these arms are mounted on trunnions or pins 69 carried by the frame. The upper ends of. the lever are pivotally connected b means of the pins 70 on the sleeve 23. .T e governor is of the usual centrifugal type having the centrifugal Weights ,71 and the centripetally acting springs 72. The detail mechanism connecting the governor elements 70 and 71 with the sleeve responsive to their movement is not shown but any welLknown mechanism of this type may be used. When the speed increases the action of the weights throws the lever 24 and thus the pin 64 so as to lift the rock arm 37 and consequently'increases the.

time during which the bypass valve 36 is opened, or in other words, retards the time i when the bypass closes and in this Way decreases the interval during which it is closed,

thus decreasing the supply of fuel in as much as fuel is delivered to the force pump only during the period in which the bypass valve is closed.

In the schematic drawing the details can be readily followed from those of the general construction. The force pump plungers, however, as shown aresupplied with rollers 73 which operate directly on the cams 55.

Following the operation of the apparatus the measuring pump 18 delivers a' constant flow offuel to the pipe 17 and this is connected, as described,'with thebypass valve. The timing is such, as indicated in Fig. 3, that the forcing pump plunger will be with drawn and started on its return or forcing stroke before the bypass valve is closed delivering the charge through the inlet valve to the pump chamber so that the pump plunger meets, as it were, the incoming charge and there is-a' definite and sharp cut off of the charged fuel at the moment the chamber is filled.' This is a more definite measuring device and is less subject to variation due to frictional resistance, expansion of parts and the expansibility of the fuel than devices which depend on the opening of the bypass valve, or other schemes for determ'inln the cut-off of the flow to the chamber. urther the beginnin of the point of discharge to the chamber 1s definite and immediately controlled by the closing of the bypass valve so that there is a definite be seen, controlsthe moment of closing the bypass valve and consequently controls the moment of the starting of the delivery of fuel to the pump chamber. The time for stopping the flow of fuel to the pump chamber, however, is controlled by the meeting of the incoming fuel-in other words, the fillmg" of the pump chamber rather than the opening of the bypass valve causing resistance to the spray nozzle is sufficient to prevent a discharge from the discharge of the force pump and consequently as soon as the pump chamber is filled and there is a tend ency for a forced return movement of the fuel through the inlet valve of the pump this closes this inlet valve and from this point on the trapped fuel in the pump chamber is discharged to the engine cylinder.

While I have shown a gear pump as part of the measuring scheme it will be understood that the device is not limited to this particular type of pump.

It will be noted that the cam 55 has a nose 55 forcing an ultimate discharge sllghtly without a circle forming a greater part of the cam. The purpose of this is to. pBlIHlt a slight backward or yielding movement of the plungerto relieve pressure from the spray nozzle and thus prevent leakage from the spray nozzle in the interval between strokes. The camis also provided with depresslons 55 which permit the intake movement of the plunger under the influence of the spring. i

What I claim as new is Y 1. The method of deliverin measured quantities of fluids to receiving instruments which consists in delivering fluid to a pulcontraction of said chamber and varying the charge by varying the point in the contracgifindof the chamber at which the chamber is 2. In a charge delivering device, the com b nation of a pulsating pump chamber; devices delivering charges to the chamber durmg the discharge contraction of the chamber; and means varying the charge comprismg a measuring pump, delivering to the pulsating pump, and devlces varying the dis charge moment of themeasuring pump.

3. In a charge delivering device, the combination of a pulsating pump chamber; devices delivering charges to the chamber during the discharge contraction of the cham her; and means varying the charge comprising a measuring pump delivering to the pulsating pump, and devices varying the discharge moment of the measuring pump, said devices comprising a bypass and variable means controlling the bypass.

i a loaded inlet valve control 4. In a charge delivering apparatus, the combination of a pulsating pump chamber; a loaded inlet valve controlling the flow of fluid to the chamber; a measuring pump discharging through the inlet valve to the pulsating pump chamber; a bypass between the measuring pump and the pulsating pump chamber comprising a loaded valve, the loading of the bypass valve being greater than the loading of the inlet valve; and means actuating the bypass valve i to vary the charge.-

5. In a charge delivering apparatus, the combination of a pulsating ump chamber;

ling the flow of fluid to the chamber; a measuring pump discharging through the inlet valve to the pullsating pump chamber; a bypass between the measuring pump and the pulsating pump chamber comprising a loaded valve, the

loading of the bypass valve being greater than the loacling of the inlet valve; and

means controlling the closing of the bypass valve during a'fforcing contraction of the pulsating pump chamber 6. In a charge delivering apparatus, the combination of a pulsating pump chamber; a loaded inlet valve controlling the flow of fluid to the chamber; a measuring pump discharging through the inlet valve to the pulsating pump chamber; a bypass between the measuring pump and the pulsating pump chamber comprising a loadedvalve, the loading of the bypass valve being greater than the loading of the inlet valve; means controlling the closing of the bypass valve during a forcing contraction of the pulsating pump chamber; and mechanism controlling i the timing of the closing of the bypass valve to vary the charge.

in testimony whereof I have hereunto set my hands HAROLD F. SHEPHERD. 

